This is a BRAND NEW-In-The-BOX Universal Furnace Relay with a 24 volt coil.It replaces Mars, Honeywell, & Diversitech Part #s9100Y233Q00, R4222D1014, & D-90340. It has two completely independant circuits with 2 seperate "Feed" terminals, 2 "Normally Open" set of contacts and 2 "Normally Closed" set of contacts. Many OEM relays do not have as many terminals on them as this one does- simply disregard any extra terminals. They are there to make the relay a universal replacement. We use them for furnace and air conditioning repairs, but they are great for any purpose. Thanks for looking and good luck!